Substituted 1-phenyl-2,5-dioxo imidazolidines

ABSTRACT

Substituted 1-phenyl-2,5-dioxo-imidazolidines are effective weed-killers in crop plant cultures. They may be used in the form of herbicidal agents.

llnited States Patent Moser et al.

[ 1 June 18, 1974 SUBSTITUTED l-PHENYL-2,5-DIOXO IMIDAZOLHDINES Inventors: Hans Moser, Basel; Christian Vogel,

Binningen, both of Switzerland Assignee: Ciba-Geigg Corporation, Ardsley,

Filed: Mar. 9, 1972 Appl. No.: 233,275

Foreign Application Priority Data References Cited OTHER PUBLICATIONS Dakin, J. Chem. Soc., (1915) 107, 434-439.

Wagner et al., Synthetic Organic Chemistry, (1953) page 92. I C. A. 75:140,853d (Sept. 9, 1971) Baskakov et al.

Primary Examiner.lohn D. Randolph Assistant Examiner-S. D. Winters Attorney, Agent, or Firm-Frederick H. Rabin; Harry Falber 5 7 ABSTRACT Substituted l-phenyl-2,S-dioxo-imidazolidines are effective weed-killers in crop plant cultures. They may be used in the form of herbicidal agents.

20 Claims, No Dra vings SUBSTITUTED l-PHENYL-2.5-DIOXO lMlDAZOLIDHNES The present invention relates to substituted 1- phenylimidazolidin-2,5-diones, a process for their manufacture, also to herbicidal agents which contain these new compounds as active substances and to a method for selectively combating weeds, which comprises the use of the new active substances and of agents which contain them.

The substituted lphenyl-2,S-dioxo-imidazolidines correspond to the formula 1 and comprise possible mineral acid salts, including also those which are formed by quaternisation of a substituted amino group.

E I X O: CH-Ri (I) In this formula, X represents a halogen atom, the cyano group, a lower alkyl or alkoxy radical, a lower alkenyloxy, alkinyloxy or alkenylthio radical, the phenoxy radical, the trifluoromethyl group, an optionally chlorinated methylsulphonyl radical or a dialkylsulphamoyl radical, n represents or an integer from 1 to 3, R represents a lower alkyl or alkoxy radical, R, represents halogen, the cyano group, the group NCS, the amino group, an alkylamino, alkenylamino, dialkylamino, cyanoalkylamino or guanidyl group, also a urea radical of theformula wherein R and R" each represents hydrogen, alkyl, aryl or alkoxy, R, also represents a radical OR', in which R' represents hydrogen, the cyano group, a cyanoalkyl radical or the group COZ, in which Z stands for alkylamino, dialkylamino, alkyl, halogenoalkyl, phenyl, alkoxy or alkylthio, and finally, R, also represents a group of the formula in which each Y independently represents oxygen or sulphur and the alkyl radicals may also be halogenated.

wherein X represents a fluorine, chlorine, bromine or iodine atom, the cyano group, an alkyl or alkoxy radical each containing from one to three carbon atoms, the trifluoromethyl radical, a methylsulphonyl or dimethylsulphamoyl radical, n is 0 or an integer from 1 to 3, R represents the methyl group, and R, represents a chlorine atom, the hydroxyl group, the amino group, or a dialkylamino, alkylcarbamoyloxy or dialkylcarbamoyloxy group containing at most three carbon atoms in the respective alkyl radical, or an optionally chlorinated, saturated aliphatic acyl radical or an 0,0- bis(alkyl)dithiophosphoryl group containing in each case at most 4 carbon atoms in the aliphatic chain,

Of the cited compounds, particular importance attaches to those in which X represents a fluorine, chlorine, bromine or iodine atom, the cyano group, the methyl, methoxy, trifluoromethyl, methylsulphonyl or dimethylsulphamoyl radical.

Among these compounds, those having particularly satisfactory action are to be singled out in which n is 0 or an integer from 1 to 3, R represents the methyl group, and R, represents a chlorine atom, the hydroxyl group, the amino group or a dialkylamino group containing at most 3 carbon atoms in the alkyl radical, the methylcarbamoyloxy, dimethylcarbamoyloxy, acetyl, chloroacetyl or an 0,0-bis(alkyl)dithiophosphoryl group, in which each of the two alkyl radicals independently represents methyl, ethyl, propyl or isopropyl.

Phenyl-imidazolidine-diones in which R, represents the hydroxyl group are particularly valuable compounds.

The new lphenyl-2,5-dioxo-imidazolidines of the formula I are obtained according to the invention by reacting a substituted phenylurea of the formula ll Kit in which X, n and R have the meanings given under formula l, with glyoxylic acid in an organic solvent, and, if desired, substituting the hydroxyl group in 4-position in the resulting substituted l-phenyl-4-hydroxy-2,5- dioxo-imidazolidine of the formula @e/KR (III) c. The substitution of the hydroxy] group in the compound (lll) by a group O-CONl-lall yl may be carried out advantageously by reacting the compound (III) with an alkylisocyanate in the presence of a condensation catalyst, for example pyridine, triethylamine etc.

d. To substitute the hydroxy] group by a group the compound (111) is reacted advantageously with a dialkylcarbamic halide in the presence of tertiary amines, for example pyridine or triethylamine.

e. To substitute the hydroxyl group by a group halogenoalkylCO-O-, the compound (111) is reacted with a halogeno-fatty acid halide or with a halogenofatty acid anhydride, preferably in the presence of tertiary amines.

f. Finally, the substitution of the hydroxyl group by a group -O-CO-S-alkyl is effected to reacting the compound of the formula II] with a chlorocarbonic thioalkyl ester in the presence of tertiary amines.

All the reactions cited under (b) to (f) are carried out in the presence of an organic solvent or diluent and in the presence of an acid binding agent or a basic condensation agent.

Suitable solvents or diluents for all the reactions cited hereinabove are aliphatic and aromatic hydrocarbons and halogenated hydrocarbons, for example benzene, toluene, chloroform, methylene chloride, ketones, in particular acetone, ether and ether-like compounds, such as dioxan, also esters, nitriles, N,N-dialkylated amides, pyridine etc., as well as mixtures of these solvents with one another.

As acid binding agents and also as condensation agents, it is possible to use, inter alia, tertiary amines, for example trialkylamines, also pyridine and pyridine bases; and as catalyst for the reaction according to (b), dimethyl formamide may also be used.

The reaction temperatures for the cited reactions are in the range from C to 150C.

The 1 -phenyl-2 ,4-dioxo-5-hydroxy-imidazolidines which are formed in slight amounts as by-products in the first reaction step can be easily isolated by recrystallising the desired compounds of the formula 111.

The following Examples illustrate the manufacture of the new substituted l-phenyl-2,S-dioxo-imidazolidines of the formula 1. Further active substances of this formula which have been manufactured according to the methods described in the Examples and cited hereinbefore, are listed in the Table following the Examples.

EXAMPLE 1 l -phenyl-3-methyl-4-hydroxy-2,5-dioxo-imidazolidine 75 Grams of N-phenyl-N'-methylurea and 56 g of glyoxylic acid monohydrate (97 percent) are suspended in 600 ml of chloroform and this suspension is boiled under reflux for 3 hours with stirring and using a water separator. Upon expiry of this time, 19 ml of water have been deposited in the water separator. The bath is cooled to room temperature, the crude product then filtered off, washed with chloroform and recrystallised from ethyl acetate, to yield 67 g of l-pheny1-3- 4 methy1-4- hydroxy-2 ,S-dioxo-imidazolidine l83l 85C).

EXAMPLE 2 EXAMPLE 3 l-phenyl-3-methyl-4-dimethylphosphoryl-2.S-dioxoimidazolidine 22.4 Grams of l-phenyl-3-methyl-4-chloro-2,5- dioxoimidazolidine and 13 ml of trimethyl phosphite are heated under reflux for 15 hours with 200 ml of benzene. Upon expiry of this time, the evolution of methyl chloride has ceased. The reaction mixture is evaporated in vacuo and the crystalline residue is recrystallised from ethyl acetate, to give 19.4 g of l-phenyl-3- methyl-4-dimethylphosphoryl-2,S-dioxo-imidazolidine, which melts in the range of 124C and l26C.

EXAMPLE 4 l-phenyl- 3-methyl-4-( methylcarbamoyloxy )-2,5 dioxo-imidazolidine 20.6 Grams of the hydroxy compound obtained according to Example 1, 9.1 ml of methylisocyanate and 1.4 ml of triethylamine are stirred in 200 ml of dioxane for 20 hours at room temperature. The clear solution is evaporated in vacuo to leave as residue a yellow oil which becomes crystalline on scratching. After recrystallisation twice from ethyl acetate, the l-phenyl-Ilmethyl-4- -methylcarbamoyloxy )-2 ,5 -dioxoimidazolidine melts at l24l 26C.

EXAMPLE 5 l-phenyl-3-methyl-4-(dimethylcarbamoyloxy)-2,5- dioxo-imidazolidine 10.6 Grams of the hydroxy compound according to Example 1, 5.1 ml of dimethyl carbamoylchloride and ml of pyridine are left to stand for 50 hours at room temperature. The reaction mixture is evaporated in vacuo, the residue treated with water and crystallised by scratching. The crystals are filtered off, washed with water and the crude product dried over P 0 Recrystallisation from ethyl acetate yields 5.9 g of l-phenyl-3- methyl-4-(dimethylcarbamoyloxy)-2,5-dioxoimidazolidine (m.p. l36-139C).

EXAMPLE 6 l-phenyl-3-methyl-4-chloroacetoxy-2,5 -dioxoimidazolidine 20.6 Grams of the hydroxy compound according to Example 1 and 18.7 g of chloroacetic anhydride are heated for 6 hours in 200 ml of dioxan at l0OC bath temperature. After the reaction mixture has cooled, the product separates out in the form of a white precipitate. It is filtered, washed with dioxan and recrystallised from methanol, to give 16.3 g of l-phenyl-3-methyl-4- chloroacetoxy-2,S-dioxoimidazolidine 137139C).

EXAMPLE 7 EXAMPLE 8 l-( 3 ,4'-dichlorophenyl )-3-methyl-4-( S-dimethoxyphosphinothioyl)thio-2,5-dioxo-imidazolidine 29.4 Grams of 1-(3,4-dichlorophenyl)-3-methyl-4- chloro-2,S-dioxo-imidazolidine are dissolved in 250 ml of absolute acetone. While stirring, 21.6 g of potassium dimethyldithiophosphate are added in small amounts. The batch is stirred overnight, the precipitated potassium chloride filtered off and the filtrate concentrated in vacuo. The yellow residual oil is dissolved in diisopropyl ether, treated with animal charcoal and evaporated once more. The residue is dried to yield 23 g of l-( 3,4'-dichlorophenyl )-3-methyl-4-(S- dimethoxyphosphinothioyl )-thio-2,5-dioxoimidazolidine in the form of a pale yellow oil.

i: |:i S calculated found (molw. 4I5.3) C 34,7l 34,97

CI l7.()7 16,90

The following Table lists the active substances of the formula I described in the Examples and further such substances which are manufactured according to :the processes of the above cited Examples, namely those of the narrower formula Melting point, N o. A ll Ill degrees 1 "Q Ulla Oll 188-185 2 CH3 OH 168-170 CHaO-- OH; OH 187-190 4 OH; OH 189-191 5 CH; OH 192-195 6 OH; OH 203-205 T OH; 011 195-198 a CH; 011 140-142 1 i CH; CH 142-145 CH3 OH 132-135 S OzN(CHs)2 Melting 1101M, No A R R dflgrees 11 3 (7H; H m: m.-

12 (3H CH3 011 151-153 13 CH OH 180-183 CHr- 14 CH OH 178-182 15 Q CH3 0H 158-160 16 OH; OH 149-151 17 CH; OH 200-202 18 OH; OH 173-174 21 Same as above CH3 P0(0CH;;) 124.20 do CH3 O-CO-NHCH3 12/1-12 O-OO-N (CH5): 13&-139 -OCO-CH:C1 -137 -OCOSC2H1 86-88 OCONHCHa -142 27 Same as above CH: -O-CO-N(CH;) .1 28 ..do CH3 0CO-CHC1 9&93

PAT. No. 3818032- F0110 405 29 CH: O K 138-191 30 OH: OH -203 32 CH1 0 H 202-205 33 CH: O H 122-131 Melting po n No. A R R1 degrees 34 CH 3 OH 196-199 (CHJ)zNOzS- 35 C113 Cl 160-162 36 Same a5 flbOVC CH3 -PO(OCH 122-124 (1 -SPS(OCH3) O QH29. :I e -NHC Hz-C N 105-107 --0 C 217-220 -NC S 80-82 CN NH-$|INH= NH: 170-172 -N (0 Hz) 2 136-138 NHC 0N(CH )g Q 215-217 -NHC ONH C1 40 cm on 202-205 C H; S O3 C Ha 0H 157-162 C H; S O z 51 J z j 0 H3 0 H 203-200 9 N (CH3) 101 179-182 C H: C N

--0 C O S OH 58 (lO CH3 CzHu -82 CgHg 59 ..d0 CH /CH(CHa)2 -141) C H Huh 60 d0 CH3 --NH-C H2-CI"1==C H: 83-8 61 d0 CH: -NH-CH5 The new l-phenyl-2,S-dioxo-imidazolidines of the formula I are readily soluble in polar and aprotic organic solvents, for example in lower aliphatic alcohols,

such as methanol, in ketones, such as acetone. also in dioxan, dimethyl :formamide and cellosolve. They are difficultly soluble in ethyl acetate. benzene and chloroform, and insoluble in water and aliphatic hydrocar bons, such as hexane, petroleum ether etc.

The substitutee phenylureas of the formula Ill used as starting materials are known compounds. If the seried out on application of the new active substances without any detrimental effects.

The herbicidal action of the active substances according to the invention was established by means of lected substitution of the phenyl radical involves using 5 the following test: a phenylurea of the general formula II which is not de- Hel'blcldal Actlqfl f the Acllve Substances On scribed in the literature, it can be easily manufactured Emergence PP i k w manner Immediately after the test plants have been sown, the The new active Substances f the f l possess active substances, in the form of an aqueous suspension excellent herbicidal properties and are particularly (Qbtamcd from a 25 percem weuable P w are P SuitabIe for Combating grass fike and broad4eaved plied to the surface of the soil. The seed dishes are then weeds in cultures of crop plants, in particular as prekept at 2 C and 50-70 P relam'e humldltyemergence herbicides in cotton plantations. The active The test evaluated after 28 days' substance of the formula I sucessfully damage or de- F plants used were' stroy one or more years old deep-rooted weeds which g l are difficult to combat. Thus field weeds such, for ex- 2; Irma ample, as panic grass species (Setaria sp.), mustard spe- Al mm florum ,d cies (Sinapis sp.), goose-foot species (Chenopodiaceae), fw f f es foxtail grass (Alopecurus sp.) and other foxtail species, z if If for example Amaranthus sp.: grasses, for example Loli- W El ems ga I um sp., compositae, for example Taraxacum sp., camo' ii fg s mile species (Matricaria sp.), are destroyed or retarded Chr t m in their growth without damage to useful plants, such albea Sege as cotton, maize, cereals, sorghum etc. In addition, va- I u r rieties of weeds which are difficult to combat in rice fi ggt cultures are attacked and destroyed by these active Crops plants: substances: for example, Echmochloa sp. in water rice plantations wheat (Trrzticum vullgarg) cotton oss um c r The rates of application vary and are dependent on I er a a) 3U sorghum (Sorghum hybrldum} the time of application. They are between (H to IO kg main 78a may? cseoa Iicaif substance per fifi i the t k i The respective rates of application m this test are listed ion e ore emergence o e p an s up 0 g in the following Tabla substance per hectare and after emergence of the The evaluation is accordin to the followin ke plants 3 to 10 kg of active substance per hectare, are I g g used. To totally destroy the entire crop of weeds, for example on fallow land neighbouring on the cultivated 9 plants undamaged (control) areas, It is necessary to use more than 10 kg of active 2 glfs g g g gf of damage substance per hectare. The crop rotation may be carnot tested Echi' C hrys- Alope- Diginoch- Set- Amaanthelpo- C d Rkate C S P oa Lohlurn curus tana loa arila rlanmum Sinamoea Pastip g ot- Ortnvimu tt myosancrus itat us segepis pur naca No. AS/ha ton Maize ghum Wheat aIis florum suorides guin. galli ica spez tun alba purea sativa 2 l 9 8 9 l 3 3 l 2 3 2 2 9 9 7 9 l 3 3 I l l l 4 9 I 2 l l l l 1 3 l 9 7 l 2 3 Z 3 e l l 2 9 9 7 l 2 3 I 2 I I 3 2 3 4 9 l l I I l l l 2 l l 4 t 9 9 9 8 1 3 3 3 t 1 1 3 2 9 8 9 7 l 2 3 3 I 1 l 2 4 9 8 7 I 2 l l l l l 2 s 0.5 7 s 1 3 2 3 l 2 1 I i 2 2 7 7 7 I 2 l 1 l l l l l I l 4 7 l l l I l l l I I I l 6 0.5 7 9 l 2 l 1 l l l 3 3 l 2 8 7 8 I 2 l l l l l l l I 4 8 l I I I l I 1 I l I 7 0.5 8 8 I 2 I l l l l 3 3 2 9 7 7 i 2 2 I l l I l 2 3 I 4 9 l l l l l l l l I l I 23 2 a a 1 7 1 3 1 3 I 1 4 a 1 2 2 2 l I 3 25 l 9 l 3 3 l t 3 1 l 1 3 i 2 9 8 I Z 2 2 2 I I 1 l 1 l 4 8 l I l I l I I Table Continued Echi- Chrys- Alope- Diginoch- Set- Amaanthelpo- Rate Pol} ll m curus taria loa aria ranmum 'Sinamoea Pasti- Cpd. kg Cot- Sortriv1- multimyosancrus italthus scgepis purmica l No. AS/ha ton Maize ghum Wheat alis florum suorides guin. galli ica spez. tun alba purett saliva l I 3s 1 9 8 9 9 2 3 2 1 1 2 9 s 9 9 2 3 2 2 1 2 1 1 4 9 7 s 1 2 2 1 1 2 1 1 Herbicidal action on pre-emergence application of acpersants or solvents which are inert towards the active tive substance No. 4 1n me with which weeds have substances. The active substances may be available and been sown can be used in the following forms:

The aqueous dispersion of active substance No. 4 is Solid forms applied to the surface of the soil in the test vessels and dusts, tracking agents, granules, coated granules, imworked in to a depth of about-1 cm. The rice test plants pregnated granules and homogeneous granules. (Oryza oryzoides) and Echinochloa crus galli are sown Liquid forms and the soil is completely saturated with water. After a. active substances which are dispersible in water: the seeds have emerged, the water level in the vessels 5 wettable powders, pastes, emulsions; is raised to about 2-3 cm above the surface of the soil. b. solutions.

. To manufacture solid forms (dusts, tracking agents), The tests are carried out in a greenhouse at 24-27C the active substances are mixed with solid carriers. and 70 percent relative humidity. The evaluation of the Suitable carriers are, for example: kaolin, talcum, botests takes place after 28 days and according to the fol- 50 lus, loess, chalk, limestone, ground limestone, attaclay, lowing key: dolomite. diatomaceous earth, precipitated silica, alkaline earth silicates, sodium and potassium aluminum sil' icates (feldspar and mica), calcium and magnesium sulgm??? phates, magnesium oxide, ground synthetic materials, 8-2 intermediate stages of damage. fert1l1sers, for example ammonium sulphate, ammonium phosphate, ammonium nitrate, urea, ground vegetable products. such as corn meal, bark dust, sawdust, R l f r I, F I, J I l nutshell meal, cellulose powder, residues of plant exkg 2;," f.,;," tractions, activated charcoal etc. These substances can either be used alone or in admixture with one another. 11,5 9 1 1 9 1 2 q I The particle me of the carriers for dusts 1s advantageously up to about 0.1 mm. for tracking agents about 0.075 to 0.2 mm. and for granules 0.2 mm or larger. The herbic1dal agents according to the mventton are 5 The concentrations of active substance in the solid manufactured inknown manner by intimately mixing and/or grinding active substances of the formula I with the suitable carriers, optionally with the addition of dispreparations are usually from 0.5 to percent.

To these mixtures can also be added additives which stabilize the active substance and/or non-ionic, anionic and cationic surface active substances, which for example improve the adhesion of the active ingredients on plants or parts of plants (adhesives and agglutinants) and/or ensure a better wettability (wetting agents) and dispersibility (dispersing agents). Examples of suitable adhesives are the following: olein/chalk mixture, cellulose derivatives (methyl cellulose, carboxymethyl cellulose), hydroxyethyl glycol ethers of monoalkyl and dialkyl phenols having to ethylene oxide radicals per molecule and eight to nine carbon atoms in the alkyl radical, lignin sulfonic acids, their alkali metal and alkaline earth metal salts, polyethylene glycol ethers (carbowaxes), fatty alcohol polyethylene glycol ethers having 5 to ethylene oxide radicals per molecule and eight to 18 carbon atoms in the fatty alcohol moiety, condensation products of ethylene oxide/propylene oxide, polyvinyl pyrrolidones, polyvinyl alcohols, condensation products of urea and formaldehyde, and also latex products.

The water-dispersible concentrates of the active substance, i,e., wettable powders, pastes and emulsifiable concentrates, are agents which can be diluted with water to any concentration desired. They consist of active substance, carrier, optionally additives which stabilize the active substance, surface-active substances and anti-foam agents and, optionally solvents. The concentration of active substance in these agents is 5-80 percent.

Wettable powders and pastes are obtained by mixing and grinding the active substances with dispersing agents and pulverulent carriers in suitable apparatus until homogeneity is attained. Carriers are, for example, those mentioned for the solid forms of application. in many cases it is advantageous to use mixtures of different carriers. As dispersing agents there can be used, for example, condensation products of sulfonated naphthalene and sulfonated naphthalene derivatives with formaldehyde, condensation products of naphthalene or naphthalene sulfonic acids with phenol and fomaldehyde, as well as alkali, ammonium and alkaline earth metal salts of lignin sulfonic acid, in addition, alkylaryl sulfonates, alkali and alkaline earth metal salts of dibutyl naphthalene sulfonic acid, fatty alcohol sulfates such as salts of sulfated hexadecanols, heptadecanols, octadecanols, and salts of sulfated fatty alcohol glycol ethers, the sodium salt of oleoyl ethionate, the sodium salt of oleoyl methyl tauride, ditertiary acetylene glycols, dialkyl dilauryl ammonium chloride and fatty acid alkali and alkaline earth metal salts.

Suitable anti-foam agents are silicones.

The active substances are so mixed, ground, sieved and strained with the additives mentioned above that, in wettable powders, the solid particle size of from 0.02 to 0.04 and in pastes, of 0.03 is not exceeded. To produce emulsifiable concentrates and pastes, dispersing agents such as those given in the previous paragraphs, organic solvents and water are used. Examples of suitable solvents are the following: alcohols, benzene, xylenes, toluene, dimethyl sulfoxide, and mineral oil fractions boiling between 120 and 350C. The solvents must be practically odorless, not phytotoxic, inert to the active substances and not readily inflammable.

Furthermore, the agents according to the invention can be applied in the form of solutions. For this purpose the active substance or several active substances of general formula I are dissolved in suitable organic solvents. mixtures of solvents or in water. Aliphatic and aromatic hydrocarbons, chlorinated derivatives thereof, alkyl naphthalenes, and mineral oils alone or mixed with each other, can be used as organic solvents. The solutions should contain the active substances in a concentration of from 1 to 20 percent.

The agents described according to the invention may be mixed with other biocidally active compounds or agents. Thus to broaden the activity spectrum the new agents may contain, for example, insecticides, fungicides, bactericides, fungistatics, bacteriostatics or nematocides, in addition to the cited compounds of the formula I. The agents according to the invention may also contain plant fertilisers, trace elements etc.

Preparations forms of the new imidazolidines are described hereinbelow. Parts denote parts by weight. Granules The following substances are used to manufacture 5 percent granules:

5 parts of l-(p-chlorophenyl)-3-methyl-4-hydroxy- 2,5-dioxo-imidazolidine,

0.25 parts of epichlorohydrin,

0.25 parts of cetyl polyglycol ether,

3.50 parts of polyethylene glycol ether,

91 parts of kaolin (particle size: 0.3-0.8 mm).

The active substance is mixed with epichlorohydrin and the mixture dissolved in 6 parts of acetone, then polyethylene glycol ether and cetyl polyglycol ether are added. The resulting solution is sprayed on kaolin and then evaporated in vacuo.

Wattable Powder The following constituents are used to manufacture (a) a 50 percent, (b) a 25 percent and (c) a 10 percent wettable powder:

a. 50 parts of l-(3'-chloro-4'-methyl-phenyl)-3- methyl-4-hydroxy-2,S-dioxo-imidazolidine, 5 parts of sodium dibutylnaphthalene sulphonate, 3 parts of napthalenesulphonic acid/phenolsulphonic HCldI Ol" maldehyde condensate (312:1), 20 parts of kaolin, 22 parts of Champagne chalk;

b. 25 parts of l-phenyl-3-methyl-4-chloro-2,5-dioxoimidazolidine, 5 parts of sodium oleylmethyltauride, 2.5 parts of naphthalenesulphonic acid/formaldehyde condensate, 0.5 parts of carboxymethyl cellulose, 5 parts of neutral potassium aluminium silicate, 62 parts of kaolin;

c. 10 parts of l-(3'-methyl-4'-bromophenyl)-3- methyl-4-hydroxy-2,5-dioxo-imidazolidine, 3 parts of a mixture of the sodium salts of saturated fatty alcohol sulphates, 5 parts of naphthalenesulphonic acid/formaldehyde condensate, 82 parts of kaolin.

The indicated active substance is applied to the corresponding carriers (kaolin and chalk) and then these are mixed and ground, to yield wettable powders of excellent wettability and having an excellent capacity for forming suspensions, By diluting these wettable powders with water it is possible to obtain suspensions of every desired concentration of active substance. Such suspensions are used for combating weeds and weedlike grasses in cultures of crop plants.

Paste The following substances are used to manufacture a 45 percent paste:

45 parts of l-(3',4'-dichlorophenyl)-3-methyl-4- methyl-carbamoyloxy)-2,5-dioxo-imidazolidine,

5 parts of sodium aluminium silicate,

14 parts of cetyl polyglycol ether with 8 mols of ethylene oxide,

1 parts of oleyl polyglycol ether with mols of ethylene oxide,

2 parts of spindle oil,

parts of polyethylene glycol,

23 parts of water.

The active substance is intimately mixed with the additives in appropriate devices and ground. A paste is obtained from which, by diluting it with water, it is possible to manufacture suspensions of every desired concentration of active substance. The suspensions are suitable for treating vegetable cultures.

Emulsion Concentrate 25 parts of 1-(3', 4'-dichlorophenyl)-3-methyl-4-chloroacetoxy-Z,5- dioxo-imidazolidine,

5 parts of a mixture of nonylphenolpolyethylene and calcium-dodecyhlbenzene-sulphonate,

35 parts of 3,5,5-trimethyl-2-cyclohexen-l-one,

35 parts of dimethyl formamide ,are mixed together. This concentrate can be diluted with water to give emulsions in desired concentrations. Such emulsions are suitable, for example, for combating weeds in crop plant cultures, such as cotton, maize etc.

What we claim is:

1. A substituted l-phenyl-2,5-dioxo-imidazolidine of the formula I wherein X represents a halogen atom, the cyano group, a C,-C alkyl or C,-C;, alkoxy radical, a C alkenyloxy, C alkinyloxy or C alkenylthio radical, the phenoxy radical, the trifluoromethyl group, an optionally chlorinated methylsulphonyl radical or a dialkylsulphamoyl radical having C,C,, alkyl groups, n represents 0 or an integer from 1 to 3, R represents a lower alkyl radical, R, represents halogen, the cyano group, the group -NCS, the amino group, a C,-C alkylamino, C alkenylamino, dialkylamino or cyanoalkylamino radical having C,C alkyl groups, or guanidyl group, also a urea radical of the formula wherein R and R" each represents hydrogen, C,C alkyl, or phenyLR, also represents a radical -OR"', in which R' represents hydrogen, the cyano group, a cyanoalkyl radical having C ,-C,, alkyl groups or the group -COZ, in which Z stands for alkylamino, dialkylamino, or alkyl radicals with 1-6 carbon atoms in the alkyl group, halogenomethyl, phenyl, or C ,C,, alkylthio, and finally, R, also represents a group of the formula wherein each alkyl group contains from l6 carbon atoms, and in which each Y represents independently oxygen or sulphur and the alkyl radical may also be halogenated, and mineral acid salts thereof also those which can be obtained by quaternising a substituted amino group.

2. l-Phenyl-2,5-dioxo-imidazolidines according to claim 1, wherein X represents a fluorine, chlorine, bromine or iodine atom, the cyano group, an alkyl or alkoxy radical each containing from one to three carbon atoms, the trifluoromethyl, a methylsulphonyl or a dimethylsulphamoyl radical, n is 0 or an integer from 1 to 3, R represents the methyl group, and R, represents a chlorine atom, the hydroxyl group, the amino group, or an alkylamino, alkenylamino, dialkylamino, alkylcarbamoyloxy or dialkylcarbamoyloxy group containing at most three carbon atoms in the respective alkyl radicals, or an optionally chlorinated acetoxy radical or an 0,0-bis(alkyl)dithiophosphoryl group containing in each case at most 4 carbon atoms in the aliphatic chain.

3. I-Phenyl-2,5-dioxo'imidazolidine according to claim 2, wherein X represents a fluorine, chlorine, bromine or iodine atom, the cyano group, the methyl, methoxy, trifluoromethyl, methylsulphonyl or dimethylsulphamoyl radical.

4. 1-Phenyl-2,5'-dioxo-imidazolidines according to claim 2, wherein X represents a fluorine, chlorine, bromine or iodine atom, the cyano group, the methyL methoxy, trifluoromethyl, methylsulphonyl or dimethylsulphamoyl radical, n is O or an integer from 1 to 3, R represents the methyl group, and R, represents a chlorine atom, the hydroxyl, amino, alkyl amino or a dialkylamino group, containing at most three carbon atoms in the alkyl radicals, the methylcarbamoyloxy, dimethylcarbamoyloxy, acetoxy, chloroacetoxy group or an 0,0-bis(alkyl)dithiophosphoryl group, in which each of the two alkyl radicals independently represents methyl, ethyl, propyl or isopropyl.

5. 1-(p-bromo-m-tolyl )-2,5-dioxo-3-methyl-4- hydroxy-imidazolidine according to claim 1.

6. l-(p-chlorophenyl )-2,5-dioxo-3-methyl-4- hydroxy-imidazolidine according to claim 1.

7. l-( p-bromophenyl )-2,5-dioxo-3-methyl-4- hydroxy-imidazolidine according to claim 1.

8. l-( m,p-dichlorophenyl)-2,5-dioxo-3-methyl-4- hydroxyimidazolidine according to claim 1.

9. l-( m-bromophenyl )-2,5-dioxo-3-methyl-4- hydroxy-imidazolidine according to claim 1. l

10. l-(m-fluorophenyl)-2,5-dioxo-3-methyl-4- hydroxy-imidazolidine according to claim 1.

ll. 1-( p-fluorophenyl )-2,5-dioxo-3-methyl-4- hydroxyimidazolidine according to claim 1.

l2. l-(m,p-dichlorophenyl)-2,5-dioxo-3-methyl-4- methylcarbamoyloxy-imidazolidine according to claim 1.

l3. 1-(m,p-dichlorophenyl)-2,5-dioxo-3-methyl-4- dimethylcarbamoyloxy-imidazolidine according to claim 1.

l4. l-(m,p-dichlorophenyl)-2,5-dioxo-3-methyl-4- monochloroacetoxy -imidazolidine according to claim 1.

15. l-(m,p-dichlorophenyl)-2,5-dioxo-3-methyl-4- chloroimidazolidine according to claim 1. 

2. 1-Phenyl-2,5-dioxo-imidazolidines according to claim 1, wherein X represents a fluorine, chlorine, bromine or iodine atom, the cyano group, an alkyl or alkoxy radical each containing from one to three carbon atoms, the trifluoromethyl, a methylsulphonyl or a dimethylsulphamoyl radical, n is 0 or an integer from 1 to 3, R represents the methyl group, and R1 represents a chlorine atom, the hydroxyl group, the amino group, or an alkylamino, alkenylamino, dialkylamino, alkylcarbamoyloxy or dialkylcarbamoyloxy group containing at most three carbon atoms in the respective alkyl radicals, or an optionally chlorinated acetoxy radical or an O,O-bis(alkyl)dithiophosphoryl group containing in each case at most 4 carbon atoms in the aliphatic chain.
 3. 1-Phenyl-2,5-dioxo-imidazolidine according to claim 2, wherein X represents a fluorine, chlorine, bromine or iodine atom, the cyano group, the methyl, methoxy, trifluoromethyl, methylsulphonyl or dimethylsulphamoyl radical.
 4. 1-Phenyl-2,5-dioxo-imidazolidines according to claim 2, wherein X represents a fluorine, chlorine, bromine or iodine atom, the cyano group, the methyl, methoxy, trifluoromethyl, methylsulphonyl or dimethylsulphamoyl radical, n is 0 or an integer from 1 to 3, R represents the methyl group, and R1 represents a chlorine atom, the hydroxyl, amino, alkyl amino or a dialkylamino group, containing at most three carbon atoms in the alkyl radicals, the methylcarbamoyloxy, dimethylcarbamoyloxy, acetoxy, chloroacetoxy group or an O,O-bis(alkyl)dithiophosphoryl group, in which each of the two alkyl radicals independently represents methyl, ethyl, propyl or isopropyl.
 5. 1-(p-bromo-m-tolyl)-2,5-dioxo-3-methyl-4-hydroxy-imidazolidine according to claim
 1. 6. 1-(p-chlorophenyl)-2,5-dioxo-3-methyl-4-hydroxy-imidazolidine according to claim
 1. 7. 1-(p-bromophenyl)-2,5-dioxo-3-methyl-4-hydroxy-imidazolidine according to claim
 1. 8. 1-(m,p-dichlorophenyl)-2,5-dioxo-3-methyl-4-hydroxyimidazolidine according to claim
 1. 9. 1-(m-bromophenyl)-2,5-dioxo-3-methyl-4-hydroxy-imidazolidine according to claim
 1. 10. 1-(m-fluorophenyl)-2,5-dioxo-3-methyl-4-hydroxy-imidazolidine according to claim
 1. 11. 1-(p-fluorophenyl)-2,5-dioxo-3-methyl-4-hydroxyimidazolidine according to claim
 1. 12. 1-(m,p-dichlorophenyl)-2,5-dioxo-3-methyl-4-methylcarbamoyloxy-imidazolidine according to claim
 1. 13. 1-(m,p-dichlorophenyl)-2,5-dioxo-3-methyl-4-dimethylcarbamoyloxy -imidazolidine according to claim
 1. 14. 1-(m,p-dichlorophenyl)-2,5-dioxo-3-methyl-4-monochloroacetoxy -imidazolidine according to claim
 1. 15. 1-(m,p-dichlorophenyl)-2,5-dioxo-3-methyl-4-chloroimidazolidine according to claim
 1. 16. 1-(m,p-dichlorophenyl)-2,5-dioxo-3-methyl-4-( O,O-bis (methyl)-dithiophosphoryl)-imidazolidine according to claim
 1. 17. 1-(m,p-dichlorophenyl)-2,5-dioxo-3-methyl-4-amino-imidazolidine according to claim
 1. 18. 1-(m,p-dichlorophenyl)-2,5-dioxo-3-methyl-4-dimethyl-amino-imidazolidine according to claim
 1. 19. (1-(m,p-dichlorophenyl)-2,5-dioxo-3-methyl-imidazolidinyl (4))-trimethylammonium chloride according to claim
 1. 20. 1-(m,p-dichlorophenyl)-2,5-dioxo-3-methyl-4-(N''-methyl-N''-cyanomethylamino) -imidazolidine according to claim
 1. 